Materials Literature
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The accuracy and limitations of phase-shift analysis of modulated photocurrents as a means of determining the energy profile of localized states in amorphous semiconductors have been investigated. The basis of the existing ‘recursion procedure’ is reviewed and its deficiencies are revealed by applying the method to co…
The sequence of stages during precipitation of semiconductor (e.g., CdS, CdSe) clusters from supersaturated glasses exhibiting quantum-confinement effects was investigated. The rate of formation of nanometer-size ‘‘quantum dots’’ distributed in a continuous glass matrix is critically determined by the time and tempera…
Two synthetic peptides containing the previously identified calmodulin (CaM)-binding domain of Ca2+/CaM-dependent protein kinase II (CaM-kinase II) (residues 296-309, Payne, M. E., Fong, Y.-L., Ono, T., Colbran, R. J., Kemp, B. E., Soderling, T. R., and Means, A. R. (1988) J. Biol. Chem. 263, 7190-7195) were phosphory…
The results of a study on the loss and recovery of hydrophobicity of RTV (room-temperature vulcanizing) silicone-rubber insulator coatings in a salt-fog chamber are reported. The results complement those previously reported on the ability of the coatings to suppress leakage current and insulator flashover. The tempora…
The wettability of aged surfaces and of the bulk of naturally aged silicone and EPDM (ethylene-propylene diener monomer) insulator housings and silicone elastomer insulator coatings was studied. The samples were taken either directly from the insulators or treated by exposing them to corona discharges and/or to saline…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBulk and nanostructure Group II-VI compounds from molecular organometallic precursorsJ. G. Brennan, T. Siegrist, P. J. Carroll, S. M. Stuczynski, P. Reynders, L. E. Brus, and M. L. SteigerwaldCite this: Chem. Mater. 1990, 2, 4, 403–409Publication Date (Print):July 1, 1990Pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolten alkali-metal polychalcogenides as reagents and solvents for the synthesis of new chalcogenide materialsMercouri G. KanatzidisCite this: Chem. Mater. 1990, 2, 4, 353–363Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue…
Dispersion of an elastic wave propagating in a 76.2-mm-diameter (3 in.) Split Hopkinson Pressure Bar system was investigated with two consecutive pulses recorded in the transmitter bar. Assuming that the dispersive high frequency oscillatory components riding on the top of the main pulse originate from the first mode…
Digital imaging is used to study the instantaneous particle positions and trajectories of highly charged monodisperse 0.3-\ensuremath{\mu}m-diam polystyrene spheres in water suspension. We find that a three-dimensional fcc crystal near a smooth glass wall melts abruptly into a layered fluid as a function of the in-pla…
An exact closed-form formula is given for the energy of an array of dislocations, arranged periodically on the interface between an epitaxial layer and its substrate, when these are modelled as elastically isotropic with the same elastic constants. In the course of the formulation, the exact equivalence of equilibrium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLocal structure of semiflexible polymer meltsKevin G. Honnell, John G. Curro, and Kenneth S. SchweizerCite this: Macromolecules 1990, 23, 14, 3496–3505Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 July 1990https://doi.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConvergent synthesis of monodisperse dendrimers based upon 1,3,5-trisubstituted benzenesTimothy M. Miller and Thomas X. NeenanCite this: Chem. Mater. 1990, 2, 4, 346–349Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Published inissue 1 Jul…
Using the generalized Landau model [Phys. Rev. A 36, 1484 (1987)], the temperature and frequency dependence of the complex dielectric constant of the ferroelectric smectic-${\mathit{C}}^{\mathrm{*}}$ (Sm-${\mathit{C}}^{\mathrm{*}}$) phase and the corresponding smectic-A (Sm-A) phase is calculated. It is demonstrated h…
Two synthetic routes have been developed to produce high‐molecular‐weight organic precursors containing a high weight fraction of nitrogen. One of the precursors is a pyrolysis residue of melamine‐formaldehyde resin. The second precursor is the byproduct of an unusual low‐temperature combustion reaction of tetrazole a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond strengths of ethylene and acetyleneKent M. Ervin, Scott Gronert, S. E. Barlow, Mary K. Gilles, Alex G. Harrison, Veronica M. Bierbaum, Charles H. DePuy, W. C. Lineberger, and G. Barney EllisonCite this: J. Am. Chem. Soc. 1990, 112, 15, 5750–5759Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conductive polymer-ultrahigh-modulus polymer alloys. A solution processing route to hybrid fibers of Kevlar-polypyrroleHiroaki Nemoto, Tobin J. Marks, Donald C. De Groot, and Carl R. KannewurfCite this: Chem. Mater. 1990, 2, 4, 349–351Publication Date (Print):Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSix-coordinate quantum-mechanically weakley spin-mixed (S = 5/2, 3/2) (triflato)aquoiron(III) "picket-fence" porphyrin complex: synthesis and structural, Moessbauer, EPR, and magnetic characterizationA. Gismelseed, E. L. Bominaar, E. Bill, A. X. Trautwein, H. Winkler, H. Nas…
Polyaniline films electrodeposited from acidified nonaqueous organic media were investigated for their electropolymerization behavior and charge‐discharge characteristics. The solution system used for the electropolymerization of polyaniline film was CF 3 COOH acidified propylene carbonate, which was previously found…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of poly(diarylamines): a new class of electrochromic conducting polymersJean Guay, Royston Paynter, and Le H. DaoCite this: Macromolecules 1990, 23, 15, 3598–3605Publication Date (Print):July 1, 1990Publication History Published online1 May 200…
Abstract The oxidation kinetics of polycrystalline hafnium (Hf) at room temperature and low oxygen pressure ( P o 2 ∼ 10 −7 Torr) has been studied by x‐ray photoelectron spectroscopy (XPS). After a chemisorption stage for exposures ⩽ 5 L, Hf suboxides are initially formed and are dominant until ∼ 25 L. HfO 2 appears a…